NR 320.06(2)(g)5.5. For trout streams identified under s. NR 1.02 (7) and navigable tributaries to those trout streams, the temporary in-stream crossing shall include a culvert with a minimum diameter of 12 inches. The culvert shall be placed on the streambed and may not obstruct fish passage. Poles, small logs, or pipes may be placed side by side parallel to stream flow over the culvert. Geotextile fabric shall be placed under the culvert, poles, small logs, or pipes and under any associated approach fill. NR 320.06(2)(g)6.6. The temporary in-stream crossing shall be placed and removed during frozen or low flow conditions. NR 320.06 NoteNote: Frozen conditions would exist when the stream is covered with ice thick enough to support vehicles and low flow conditions would exist when there is little or no water in the streambed.
NR 320.06(2)(g)7.7. The poles, small logs, or pipes shall be cabled, chained or banded together prior to installation to facilitate removal. NR 320.06(2)(g)8.8. The temporary in-stream crossing shall be removed after the project requiring temporary access is completed or 160 days after installation, whichever occurs first. NR 320.06 NoteNote: Removal of a temporary in-stream crossing must comply with the time periods specified in par. (b) 3.
NR 320.06(2)(g)9.9. The temporary in-stream crossing shall be installed and removed a single time, except for maintenance of the structure as authorized in par. (c) 8. NR 320.06(2)(g)10.10. Issuance of a general permit under this paragraph constitutes a waiver of the vertical clearance standards under s. NR 320.04. NR 320.06(2)(h)1.1. Activities that do not meet the standards in par. (c) and either par. (d), (e), (f), or (g), or a general permit issued by the department shall require an individual permit. NR 320.06(3)(a)2.2. If the department determines that a proposal submitted under this section has the potential to impact an endangered or threatened species in accordance with s. 29.604, Stats., the application shall be deemed incomplete. The department may not consider the application complete or issue an individual permit until the applicant submits documentation to demonstrate one of the following: NR 320.06(3)(a)2.a.a. The project avoids impacts to the endangered or threatened species in accordance with s. 29.604, Stats. NR 320.06(3)(a)3.3. If the applicant modifies the project plans to meet the requirements of subd. 2., the modified plans shall be submitted before the department may consider the application complete or issue an individual permit. NR 320.06(3)(b)(b) Applicable activities. Any bridge or culvert which is not exempt under sub. (1) and is not authorized by a general permit under sub. (2) requires authorization by an individual permit under s. 30.123 (8), Stats. Individual permits will be required for streams with required culvert areas in excess of 40 square feet. NR 320.06(3)(c)(c) Standards. Construction, placement or maintenance of a bridge or culvert that meets the standards in s. 30.123 (8) (c), Stats., may be authorized under an individual permit. NR 320.06 HistoryHistory: CR 04-084: cr. Register April 2005 No. 592, eff. 5-1-05; CR 06-038: am. (2) (b) and (c), r. and recr. (2) (d) and (e), renum. (2) (g) to be (2) (h) and am. (2) (h) 1., cr. (2) (g) Register January 2007 No. 613, eff. 2-1-07; CR 07-094: cr. (1) (c) 15., (d) 7. and (2) (c) 10. Register November 2008 No. 635, eff. 12-1-08; correction in (2) (b) made under s. 13.92 (4) (b) 7., Stats., Register May 2013 No. 689; CR 22-013: am. (1) (a), (2) (a) 1., (3) (a) 1. Register June 2023 No. 810, eff. 7-1-23. NR 320.07NR 320.07 Culvert area calculation, culvert sizing, and culvert length determination. Applicants shall use the following calculation and assessment methods: NR 320.07(1)(1) Calculation of required culvert area. To determine the required culvert area, 3 measurements shall be made: channel width of the stream in feet at the ordinary high water mark (W1), channel width of the stream in feet at the stream bottom (W2), and the height in feet of the high water above the stream bottom (H) (see diagram). These 3 measurements shall be made at each of 3 locations or transects along the stream: the location of the proposed crossing, 100 feet upstream from the crossing, and 100 feet downstream from the crossing. The individual measurements of W1, W2 and H shall be averaged to derive the final W1, W2 and H values. The required culvert area is then calculated with the following equation: Required Culvert area (square feet) = H x (W1 + W2)
NR 320.07(2)(2) Culvert sizing. Once the required culvert area has been determined, the applicant can identify the proper culvert size by reviewing the following tables. The minimum size culvert needed to pass flows must have an area that is as much or more than the required culvert area. For example, the recommended culvert size for a culvert area calculation of 8.50 square feet would be 42″. Table 1. Round culvert diameters and corresponding culvert area.
Culvert diameter (in.) Culvert area (sq. ft.)
18 1.80
24 3.10
30 4.90
36 7.10
42 9.60
48 12.60
54 15.90
60 19.60
66 23.80
NR 320.07 NoteNote: To find the area of any round culvert, use the following equation:
NR 320.07 NoteCulvert diameter (in.) divided by 2 = _____ divided by 12 = _____ (radius in ft.)
NR 320.07 NoteRadius x Radius x 3.14 = _________ (area of culvert in sq. ft.)
Table 2. Pipe arch dimensions and corresponding culvert area.
Pipe width or span (in.) Pipe height or rise (in.) Culvert area (sq. ft.)
43 27 6.4
50 31 8.7
58 36 11.4
65 40 14.3
72 44 17.6
73 55 22.0
85 54 25.3
81 59 26
87 63 31
95 67 35
103 71 40
NR 320.07(3)(3) Culvert length determination. The proper culvert length is determined by the following calculation: NR 320.07 HistoryHistory: CR 04-084: cr. Register April 2005 No. 592, eff. 5-1-05. NR 320.08(1)(1) Noncompliance with the provisions of ss. 30.12, 30.123, 30.20 and 30.206, Stats., this chapter, or any conditions of an exemption, general permit or individual permit issued by the department, constitutes a violation and may result in a forfeiture. The department may seek abatement under s. 30.294, Stats., for any activity in violation of ss. 30.12, 30.123, 30.20 and 30.206, Stats. NR 320.08(2)(2) If the activity may be authorized by a general permit under s. 30.206, Stats., failure of an applicant to follow the procedural requirements may not, by itself, result in abatement of the activity. NR 320.08(3)(3) When an after-the-fact permit application has been filed with the department, the department shall follow the procedures in ch. NR 300 for violations. NR 320.08(4)(4) Any violation of these rules shall be treated as a violation of the statutes they interpret or are promulgated under. NR 320.08(5)(5) No person may place a bridge or culvert in or over a navigable waterway if the activity is not eligible for an exemption, authorized by a general permit or individual permit issued under this chapter, or otherwise authorized under this chapter. NR 320.08 HistoryHistory: CR 04-084: cr. Register April 2005 No. 592, eff. 5-1-05; CR 22-013: am. (3) Register June 2023 No. 810, eff. 7-1-23.
